Easily view liquid movement and level changes from a distance—these sights have an indicator ball inside the glass window.

Machined from one piece of stain- and impact-resistant plastic.

The window and body are made from a single piece of plastic, making these sights more shatter resistant than sights with a glass window.

Often used in kilns and other heating equipment, these sights have a quartz window that can withstand temperatures up to 1600° F. They're also known as peep sights.

Press these sights into a hole in your tank wall; no additional mounting nuts are needed. They mount from the outside.

Weld these sights to single-wall tanks.

Designed with quick-clamp (KF) connections, these sights connect to a port on a high-vacuum chamber, so you can monitor what's happening inside.